integrate a class with Tomcat

Hi There, I want to run my java class with the tomcat instance (It means whenever the Tomcat is started, my java class should be instantiated ) The reason for doing this is that i have 'schedule reports' functionality to be implemented in my project.

For this i have written a java class (with the java.util.TimerTask)This class should continuosly run with tomcat and according to the schedule it will call the releated java class.

Can anybody tell me how to integrate my 'scheduler' class with Tomcat so that whenever tomcat is running my class should also run with it???